Nigerian troops have clashed with Boko Haram extremists in fierce fighting that killed more than 200 combatants, while insurgents have looted villages, slit residents' throats and abducted dozens of people.

Secretary of State John Kerry has tried to spur slow-moving UN climate talks, telling nations to stop bickering over who is to blame for global warming and to shun the cheap route of high-polluting coal.

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